One of three hidden in this puzzle, based on its surroundings (9)

I believe the answer is:

chameleon

(Other definitions for chameleon that I've seen before include "Lizard whose skin changes colour" , "Small lizard able to change colour" , "One to blend in" , "Ha! Clone me (anag)" , "fickle person" .)

I've seen this clue in The Wall Street Journal.

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